Determining the maximum RAM I can upgrade my PC to and what type

"You may find that the free CPU-Z utility offers some useful information. Certainly some of the information is overkill, but I have used this before to find my exact motherboard model number and the specs of my current RAM, which helped me answer your exact question (by enabling me to Google the motherboard model as retrieved from the motherboard itself.)

EDIT: Per ~quack's comment above, CPU-Z will tell you how many RAM slots you have empty or filled, without needing to get under your desk to open the case itself. :)

CPU-Z is a freeware that gathers
information on some of the main
devices of your system.

CPU


Name and number.
Core stepping and process.
Package.
Core voltage.
Internal and external clocks, clock multiplier.
Supported instructions sets.
Cache information.


Mainboard


Vendor, model and revision.
BIOS model and date.
Chipset (northbridge and southbridge) and sensor.
Graphic interface.


Memory


Frequency and timings.
Module(s) specification using SPD (Serial Presence Detect) : vendor,
serial number, timings table.


System


Windows and DirectX version."

"there are about 30 different Medion MT7 models, take your pick.

Examples:

PC MT7 MED MT272

512MB (removable), 4GB max, 4 ports.

PC MT7 MET MT515

1GB (removable), 2GB max, 2 ports."